I cannot find anything about parameter limit except implied 256 character limit and the Data Pane Specifications. Which I have listed below.

**Data Pane Specifications **

Maximum worksheet size: 65,536 rows by 256 columns
Maximum number of worksheets: 256 (255 sheets in addition to the Global datatable).
Column width: 0 to 255 characters
Text length: 16,383 characters
Formula length: 1024 characters
Number precision: 15 digits
Largest positive number: 9.99999999999999E307
Smallest positive number: 1E-307
Largest negative number: -1E-307
Smallest negative number: -9.99999999999999E307
Maximum number of names per workbook: Limited by available memory
Maximum length of name: 255
Maximum length of format string: 255
Maximum number of tables (workbooks): Limited by system resources (windows and memory)